Grate the zucchini and carrot on the large holes of a box grater in a colander set over a bowl. Sprinkle with salt and let stand 15 minutes. Squeeze the excess liquid from the vegetables. Put the beans in a medium bowl and mash with a fork. Stir in the zucchini mixture, parsley, lemon zest, a pinch of salt and a few grinds of pepper.
Form into 12 patties, each about 2 inches in diameter. Spread the cornmeal in a shallow dish and coat each patty with the cornmeal.
Heat 1/4 cup of the oil in a large skillet over medium-high heat. Working in batches and adding the remaining 1/4 cup oil as needed, cook the fritters until crisp and golden on both sides, about 2 minutes per side. Transfer to a paper-towel-lined plate and season with salt. Serve with lemon wedges on the side.
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